Photovoltaic power station active power integrated closed-loop control method and electronic equipment

Abstract

The invention provides an active power integrated closed-loop control method for a photovoltaic power station. The active power integrated closed-loop control method comprises the following steps: obtaining a first instruction value according to a scheduling instruction; calculating first power according to inverter information; obtaining a calculation deviation according to the first instruction value and the first power; comparing the absolute value of the calculated deviation with a deviation dead zone limit value; when the absolute value of the calculation deviation is greater than the deviation dead zone limit value, obtaining the current deviation according to the calculation deviation; comparing the absolute value of the current deviation with the switching boundary value; if the absolute value of the current deviation is larger than the switching boundary value, a second instruction value is calculated through pure proportional control; if the second comparison result is that the absolute value of the current deviation is not greater than the switching boundary value, calculating a second instruction value by adopting proportional-integral control; and allocating a scheduling instruction according to the second instruction value and the inverter information. According to the invention, a control mode of switching between pure proportional control and proportional-integral control is adopted, so that an instruction can be accurately tracked, and the adjusting process is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power stations, and in particular to an integrated closed-loop control method for active power of a photovoltaic power station. Background Art

[0002] In recent years, with the rapid development of science and technology, the demand for energy has also increased. The amount of energy a country has and the degree of its development and utilization directly affect the country's comprehensive strength and development level. Traditional energy is mainly fossil energy. Since fossil fuels are mainly formed by the remains of animals and plants in ancient times in the ground for hundreds of millions of years, fossil energy is regarded as a non-renewable energy source. Its storage capacity will decrease with the increase in usage until it is exhausted. In addition, the combustion of fossil fuels will release harmful gases into the air, seriously polluting the air. While the air quality is getting worse and worse, it will produce a greenhouse effect, causing global temperatures to rise, glaciers to melt, and sea levels to rise. At present, humans have realized the energy problem and its adverse effects, so the development and utilization of new renewable energy has achieved unprecedented development. The progress and development of human civilization is promoting energy reform. Conversely, energy reform is also promoting the improvement of social productivity and bringing better life to people. At this stage, a better life makes people aware of the importance of the environment, so clean energy has become particularly important. Among them, electricity has become one of the most important energy sources. People's lives and the development of the world cannot be separated from electricity. In order to solve the shortage of electricity and environmental problems, the country has introduced many policies to promote the development of new energy, among which wind power, photovoltaic power and hydropower are particularly prominent. my country has a vast territory and rich solar energy resources. According to statistics from the National Energy Administration, as of January to November 2023, my country's cumulative installed capacity is about 2.85 billion kWh, of which solar power generation installed capacity is about 560 million kilowatts, a year-on-year increase of 49.9%. It can be seen that photovoltaic power generation is currently in a rapid growth stage in my country.

[0003] Photovoltaics is a new type of energy. Due to the uncertainty of weather conditions and the randomness of light intensity, the export power of photovoltaic power generation is random and volatile. When large-scale photovoltaic power stations are connected to the grid, if no treatment is done, the voltage fluctuation of the grid will increase. In recent years, with the vigorous promotion of national policies, the installed capacity of photovoltaic stations has continued to increase, the installed capacity of photovoltaic panels in a single photovoltaic power station has also increased, and the number of controlled inverters in photovoltaic power stations has also increased. Since a single photovoltaic array cannot guarantee that the output of each photovoltaic panel meets the requirements, and the export power of the photovoltaic power station is unstable due to various fluctuations, this poses a great challenge to the precise and rapid control of photovoltaic stations. In order to standardize the response rate and control accuracy of photovoltaic power stations and reduce their impact on the power grid, the state and the industry have issued many corresponding standards and assessment indicators.

[0004] Traditional distributed photovoltaic power stations only consider the operational status of photovoltaic inverters, and adopt open-loop control according to the operational status of photovoltaic inverters, without considering the situation where there are faulty photovoltaic panels in a single photovoltaic array. After obtaining the active power command issued by the dispatching / AGC coordination controller, it directly distributes the active power command evenly according to the installed capacity of each inverter. This makes it impossible to accurately track the active power command value when there is a faulty inverter. There is a certain deviation between the photovoltaic power station command and the actual output, and this deviation will increase with the current maximum output of the photovoltaic station.

[0005] Traditional closed-loop control methods mostly use deviation-based proportional or proportional-integral control. Since pure proportional control cannot achieve zero-difference regulation, an integral link needs to be introduced. However, if proportional-integral control is used, due to the issuing cycle and step length of the instructions of the photovoltaic power station, the integral saturation problem will occur, causing system overshoot and increasing the system adjustment time. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an integrated closed-loop control method for active power of a photovoltaic power station. The method performs closed-loop control on the photovoltaic station by obtaining the current deviation between the real-time calculation scheduling instruction and the total actual active power generated by the photovoltaic power station at the current moment. In order to avoid the problem of excessive integration caused by the instruction issuance cycle, a pure proportional control and proportional integral control phase switching control method is adopted, which effectively solves the problem of an increase in tracking deviation of the photovoltaic power station as the instruction increases, which is caused by traditional open-loop control.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: a photovoltaic power station active power integrated closed-loop control method, comprising the following steps:

[0008] Obtain dispatch instructions, deviation dead zone limit, switching boundary value and inverter information;

[0009] Obtaining a first instruction value according to the dispatch instruction, the first instruction value being an active setting value input by the controller at the current moment: calculating a first power according to the inverter information, the first power being the total active power generated by the photovoltaic power station at the current moment;

[0010] Obtaining a calculation deviation according to the first instruction value and the first power;

[0011] Performing a first comparison between the absolute value of the calculated deviation and the deviation dead zone limit to obtain a first comparison result;

[0012] When the first comparison result is that the absolute value of the calculated deviation is greater than the deviation dead zone limit, obtaining a current deviation according to the calculated deviation;

[0013] Performing a second comparison between the absolute value of the current deviation and the switching boundary value to obtain a second comparison result;

[0014] When the second comparison result is that the absolute value of the current deviation is greater than the switching limit value, a second instruction value is calculated by pure proportional control, and the second instruction value is an active power setting value of the photovoltaic power station calculated by the controller based on the deviation;

[0015] When the second comparison result is that the absolute value of the current deviation is not greater than the switching limit value, proportional integral control is used to calculate the second instruction value;

[0016] The scheduling instruction is allocated according to the second instruction value and the inverter information.

[0017] Furthermore, the step of obtaining the first instruction value according to the scheduling instruction is:

[0018] Obtaining a third instruction value and an instruction setting dead zone value; the third instruction value is an active setting value input by the controller at the last moment;

[0019] Obtaining an instruction difference according to the scheduling instruction and the third instruction value;

[0020] Performing a third comparison between the absolute value of the instruction difference and the instruction setting dead zone value to obtain a third comparison result;

[0021] When the third comparison result is that the absolute value of the instruction difference is not less than the instruction setting dead zone value, obtaining a first instruction value according to the scheduling instruction;

[0022] When the third comparison result is that the absolute value of the instruction difference is smaller than the instruction setting dead zone value, the scheduling instruction is not executed.

[0023] Further, when the third comparison result is that the absolute value of the instruction difference is smaller than the instruction setting dead zone value, the first instruction value is the third instruction value.

[0024] Further, performing a fourth comparison between the absolute value of the current deviation and the deviation dead zone limit value to obtain a fourth comparison result;

[0025] When the fourth comparison result is that the absolute value of the current deviation is not greater than the deviation dead zone limit, the dispatching instruction is not allocated according to the second instruction value and the inverter information;

[0026] Otherwise, the scheduling instruction is allocated according to the second instruction value and the inverter information.

[0027] Further, not executing the allocation of the scheduling instruction according to the second instruction value and the inverter information includes:

[0028] The second instruction value is the fourth instruction value; the fourth instruction value is the active instruction return value executed at the last moment. Further, the second instruction value is obtained according to formula 1, and the formula 1 is:

[0029] PV cmd_out =Kp*err+Ki*inte(k)+PV act (k);

[0030] Where, PV cmd_out is the active power setting value of the photovoltaic power station calculated by the controller based on the deviation, Kp is the proportional coefficient, err is the current deviation, Ki is the integral coefficient, inte(k) is the accumulated amount of deviation integral at the current moment, PV act (k) is the total active power generated by the photovoltaic power station at the current moment.

[0031] Further, when the first comparison result is that the absolute value of the calculated deviation is not greater than the deviation dead zone limit, the current deviation and the first integral accumulation amount are reset to zero, and the first integral accumulation amount is the deviation integral accumulation amount at the current moment.

[0032] Further, when the second comparison result is that the absolute value of the current deviation is greater than the switching boundary value, the current deviation and the first integral accumulation amount are reset to zero, and the first integral accumulation amount is the deviation integral accumulation amount at the current moment;

[0033] When the second comparison result is that the absolute value of the current deviation is not greater than the switching boundary value, the integral coefficient is the current integral coefficient, the first integral accumulation amount is the sum of the second integral accumulation amount and the current deviation, and the second integral accumulation amount is the deviation integral accumulation amount at the previous moment.

[0034] Further, the step of allocating the scheduling instruction according to the second instruction value and the inverter information is:

[0035] Obtaining a first quantity, a second quantity, a second power and an installed capacity according to the inverter information; the first quantity is the number of stopped or faulty inverters, the second quantity is the number of normally operating inverters, the second power is the actual active power generated by a single stopped or faulty inverter; the installed capacity is the installed capacity of a single normally operating inverter;

[0036] Obtain a third power according to the first quantity and the second power, where the third power is the total active power generated by all stopped or faulty inverters;

[0037] Obtaining a total installed capacity according to the second number and the installed capacity, where the total installed capacity is the sum of installed capacities of inverters operating normally;

[0038] Obtaining a fifth command value according to the difference between the second command value and the third power, wherein the fifth command value is a total active power command value of the inverter that can be allocated;

[0039] The command value allocated to a single normally operating inverter is obtained according to the fifth command value, the installed capacity and the total installed capacity.

[0040] An electronic device, used to implement the photovoltaic power station active power integrated closed-loop control method, comprising a data input module, a data processing module, a comparison and decision module, a controller and an execution module;

[0041] The data input module:

[0042] Used to obtain dispatch instructions, deviation dead zone limit, switching boundary value and inverter information;

[0043] The data processing module:

[0044] Used to obtain the first instruction value according to the scheduling instruction;

[0045] Used to calculate the first power according to the inverter information;

[0046] for obtaining a calculation deviation according to the first instruction value and the first power;

[0047] for obtaining a current deviation according to the calculated deviation based on the first decision;

[0048] The comparison decision module:

[0049] Used to perform a first comparison between the absolute value of the calculated deviation and the deviation dead zone limit to obtain a first comparison result;

[0050] for sending a first decision to the data processing module when the first comparison result is that the absolute value of the calculated deviation is greater than the deviation dead zone limit;

[0051] for performing a second comparison between the absolute value of the current deviation and the switching boundary value to obtain a second comparison result;

[0052] for sending a second decision to the controller when the second comparison result is that the absolute value of the current deviation is greater than the switching limit value;

[0053] for sending a third decision to the controller when the second comparison result is that the absolute value of the current deviation is not greater than the switching limit value;

[0054] The controller:

[0055] for calculating a second command value by adopting pure proportional control based on the second decision;

[0056] for calculating the second instruction value by using proportional-integral control based on the third decision;

[0057] Used to send the second instruction value to the execution module;

[0058] The execution module:

[0059] Used to allocate the scheduling instruction according to the second instruction value and the inverter information.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] The integrated closed-loop control method for active power of a photovoltaic power station proposed in the present invention effectively solves the problem that traditional control algorithms cannot accurately track instructions by calculating the current deviation of the photovoltaic station, judging the deviation dead zone and judging the instruction dead zone.

[0062] The integrated closed-loop control method for active power of a photovoltaic power station proposed in the present invention realizes accurate tracking of the controller while reducing the volatility of the regulation process by setting the integral intervention interval, the integral action dead zone, and the integral automatic clearing, and adopts a control mode of switching between pure proportional control and proportional integral control. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a flow chart of the integrated closed-loop control method of active power of a photovoltaic power station according to the present invention;

[0064] Figure 2 This is the effect diagram of the photovoltaic power station simulation test using the traditional control algorithm;

[0065] Figure 3 This is a simulation test effect diagram of the photovoltaic power station active power integrated closed-loop control method proposed in this embodiment;

[0066] Figure 4 Schematic diagram of signal transmission relationship of electronic equipment in an embodiment of the present invention. DETAILED DESCRIPTION

[0067] It is worth noting that the methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products, and their sources are not specifically limited unless otherwise specified.

[0068] A photovoltaic power station active power integrated closed-loop control method comprises the following steps:

[0069] Obtain dispatching instructions, deviation dead zone limit, switching boundary value and inverter information; the dispatching instruction is the active power instruction value received by the photovoltaic power station at the current moment;

[0070] The first instruction value is obtained according to the dispatch instruction. The first instruction value is the active power setting value input by the controller at the current moment:

[0071] Preferably, in order to prevent the controller from acting frequently, the step of obtaining the first instruction value according to the scheduling instruction is:

[0072] Obtaining a third instruction value and an instruction setting dead zone value; the third instruction value is the active setting value input by the controller at the last moment;

[0073] Obtaining an instruction difference according to the scheduling instruction and the third instruction value;

[0074] Performing a third comparison between the absolute value of the instruction difference and the instruction setting dead zone value to obtain a third comparison result; judging whether to execute the scheduling instruction according to the third comparison result, thereby realizing instruction dead zone judgment;

[0075] When the third comparison result is that the absolute value of the instruction difference is not less than the instruction setting dead zone value, obtaining the first instruction value according to the scheduling instruction;

[0076] When the third comparison result is that the absolute value of the instruction difference is less than the instruction setting dead zone value, the scheduling instruction is not executed, and the first instruction value is the third instruction value;

[0077]

[0078] Where, PV set (k) is the active setting value input by the controller at the current moment, that is, the first command value, PV cmd (k) is the active power command value received by the PV power station at the current moment, that is, the dispatch command, PV set (k-1) is the active setting value input by the controller at the previous moment, that is, the third command value, PV cmddead Set the dead zone value for the command;

[0079] Calculate a first power according to the inverter information, where the first power is the total active power generated by the photovoltaic power station at the current moment;

[0080] Obtaining a calculation deviation according to a first command value and a first power;

[0081] err'=PV set (k)-PV act (k);

[0082] Where err' is the calculation error, PV act (k) the total active power generated by the photovoltaic power station at the current moment, i.e., the first power;

[0083] Performing a first comparison between the absolute value of the calculated deviation and the deviation dead zone limit to obtain a first comparison result, and implementing deviation dead zone judgment through the first comparison result;

[0084] When the first comparison result is that the absolute value of the calculated deviation is not greater than the deviation dead zone limit, the current deviation and the first integral accumulation are reset to zero, and the first integral accumulation is the deviation integral accumulation at the current moment;

[0085] When the first comparison result is that the absolute value of the calculated deviation is greater than the deviation dead zone limit, obtaining the current deviation according to the calculated deviation;

[0086]

[0087] In the formula, err is the current deviation, inte(k) is the deviation integral accumulation at the current moment, that is, the first integral accumulation, which is, err dead is the deviation dead zone limit;

[0088] A second comparison is performed between the absolute value of the current deviation and the switching boundary value to obtain a second comparison result, and the control mode is switched through the second comparison result, that is, the pure proportional control and the proportional integral control are switched;

[0089] When the second comparison result is that the absolute value of the current deviation is greater than the switching boundary value, the second instruction value is calculated by pure proportional control, and the second instruction value is the active power setting value of the photovoltaic power station calculated by the controller based on the deviation; preferably, when the second comparison result is that the absolute value of the current deviation is greater than the switching boundary value, the current deviation and the first integral accumulation are reset to zero, and the first integral accumulation is the deviation integral accumulation at the current moment;

[0090] When the second comparison result is that the absolute value of the current deviation is not greater than the switching boundary value, the proportional integral control is used to calculate the second instruction value; preferably, when the second comparison result is that the absolute value of the current deviation is not greater than the switching boundary value, the integral coefficient is the current integral coefficient, the first integral accumulation amount is the sum of the second integral accumulation amount and the current deviation, and the second integral accumulation amount is the deviation integral accumulation amount at the previous moment;

[0091]

[0092] Where Ki is the integral coefficient, err lin is the switching boundary value, inte(k-1) is the deviation integral accumulation at the previous moment, that is, the second integral accumulation;

[0093] In order to prevent the excessive accumulation caused by the instruction cycle and step length, which will cause a large overshoot and increase the adjustment time, the switch between pure proportional control and proportional integral control is set. When the absolute value of the current deviation is large, pure proportional control is used, and when the absolute value of the current deviation is small, proportional integral control is used.

[0094] Preferably, the second instruction value is obtained according to Formula 1, which is:

[0095] PV cmd_out =Kp*err+Ki*inte(k)+PV act (k)

[0096] Where, PV cmd_out is the active power setting value of the photovoltaic power station calculated by the controller based on the deviation, Kp is the proportional coefficient, err is the current deviation, Ki is the integral coefficient, inte(k) is the accumulated amount of deviation integral at the current moment, PV act (k) is the total active power generated by the photovoltaic power station at the current moment.

[0097] The scheduling instruction is allocated according to the second instruction value and the inverter information.

[0098] Preferably, in order to reduce the adjustment time and prevent the photovoltaic inverter from acting frequently, the absolute value of the current deviation is compared with the deviation dead zone limit value for the fourth time to obtain a fourth comparison result, and it is determined whether to execute the dispatching instruction according to the second instruction value and the inverter information according to the fourth comparison result, and the instruction dead zone judgment is performed again;

[0099] When the fourth comparison result is that the absolute value of the current deviation is not greater than the deviation dead zone limit, the scheduling instruction allocated according to the second instruction value and the inverter information is not executed; the second instruction value is the fourth instruction value; the fourth instruction value is the active instruction return value executed at the previous moment.

[0100] otherwise, executing the dispatching instruction allocated according to the second instruction value and the inverter information;

[0101]

[0102] Where, PV cmd_ret is the return value of the active command executed at the last moment, that is, the fourth command value;

[0103] The steps of allocating the scheduling instruction according to the second instruction value and the inverter information are:

[0104] Obtain a first quantity, a second quantity, a second power and an installed capacity according to the inverter information; the first quantity is the number of stopped or faulty inverters, the second quantity is the number of normally operating inverters, the second power is the actual active power generated by a single stopped or faulty inverter; the installed capacity is the installed capacity of a single normally operating inverter;

[0105] Obtaining a third power according to the first quantity and the second power, where the third power is the total active power generated by all stopped or faulty inverters;

[0106]

[0107] Where P pverris the total active power of all stopped or faulty inverters, i.e. the third power, i is the sequence number of the stopped or faulty inverter, n is the number of stopped or faulty inverters, i.e. the first number, P pverr (i) is the actual active power generated by the i-th stopped or faulty inverter, i.e., the second power;

[0108] Obtaining a total installed capacity according to the second quantity and the installed capacity, where the total installed capacity is the sum of the installed capacities of the inverters in normal operation;

[0109]

[0110] Where P PVcap is the sum of the installed capacities of the normally operating inverters, i.e. the total installed capacity, j is the serial number of the normally operating inverter, n is the number of normally operating inverters, i.e. the second number, P PVcap (j) is the installed capacity of the jth normally operating inverter;

[0111] Obtaining a fifth instruction value according to the difference between the second instruction value and the third power, the fifth instruction value being a total active power instruction value of the inverter that can participate in the distribution;

[0112] PV cmd_change =PV cmd_out -P pverr ;

[0113] Where, PV cmd_change is the total active power command value of the inverter that can participate in the distribution, that is, the fifth command value;

[0114] Obtaining a command value assigned to a single normally operating inverter according to the fifth command value, the installed capacity and the total installed capacity;

[0115]

[0116] Where P cmd (j) is the command value assigned to the jth normally operating inverter.

[0117] Figure 2 To use the traditional control algorithm to conduct a photovoltaic power station simulation test effect diagram, Figure 2 It can be seen that the traditional control algorithm cannot obtain the actual output of the photovoltaic power station due to the open-loop control method. When there is a faulty photovoltaic unit in the photovoltaic power station, that is, a faulty inverter, the tracking deviation of the photovoltaic power station increases with the increase of the dispatch instruction. Around 350s, due to the influence of the faulty photovoltaic unit, the actual active power generation of the photovoltaic power station stops increasing, and there is always a steady-state error of about 5MW and nearly 12% between the actual active power generation of the photovoltaic power station and the set value of the photovoltaic power station instruction.

[0118] Figure 3The simulation experiment is carried out by using the integrated closed-loop control method of active power of photovoltaic power station proposed in this embodiment. Figure 3 It can be seen that the closed-loop control algorithm, i.e., this closed-loop control method, calculates the actual photovoltaic command through the current deviation. When the photovoltaic power station command setting value cannot make the photovoltaic power station actually track this value, the closed-loop control algorithm can accurately track by raising the actual photovoltaic power station command value. Around 350s, the closed-loop control algorithm detected that the photovoltaic power station's active power generation was difficult to track the controller's output photovoltaic power station command setting value. At this time, the controller output command began to over-adjust, which was nearly 10% higher than the photovoltaic power station command setting value. At this time, the photovoltaic power station's active power generation began to meet the photovoltaic power station command requirements. The closed-loop control algorithm avoids the problem of the photovoltaic power station's active power generation not tracking the photovoltaic power station command setting value by means of closed-loop control and command overshoot.

[0119] The embodiment of the present invention also provides an electronic device for implementing an integrated closed-loop control method for active power of a photovoltaic power station, comprising a data input module, a data processing module, a comparison and decision module, a controller and an execution module;

[0120] Data input module:

[0121] Used to obtain dispatch instructions, deviation dead zone limit, switching boundary value and inverter information;

[0122] Data processing module:

[0123] Used to obtain a first instruction value according to the scheduling instruction;

[0124] Used to calculate the first power according to the inverter information;

[0125] for obtaining a calculation deviation according to a first instruction value and a first power;

[0126] for obtaining a current deviation according to the calculated deviation based on the first decision;

[0127] Comparison decision module:

[0128] Used to perform a first comparison between the absolute value of the calculated deviation and the deviation dead zone limit to obtain a first comparison result;

[0129] When the first comparison result is that the absolute value of the calculated deviation is greater than the deviation dead zone limit, sending a first decision to the data processing module;

[0130] For performing a second comparison between the absolute value of the current deviation and the switching boundary value to obtain a second comparison result;

[0131] When the second comparison result shows that the absolute value of the current deviation is greater than the switching limit value, sending a second decision to the controller;

[0132] When the second comparison result is that the absolute value of the current deviation is not greater than the switching limit value, sending a third decision to the controller;

[0133] Controller:

[0134] for calculating a second command value by adopting pure proportional control based on a second decision;

[0135] for calculating a second instruction value by using proportional-integral control based on a third decision;

[0136] Used to send the second instruction value to the execution module;

[0137] Execution module:

[0138] Used to allocate scheduling instructions according to the second instruction value and inverter information.

[0139] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A photovoltaic power station active power integrated closed-loop control method, characterized in that: The following steps are involved: Obtain dispatch instructions, deviation dead zone limit, switching boundary value and inverter information; Obtaining a first instruction value according to the dispatch instruction, the first instruction value being an active setting value input by the controller at the current moment: calculating a first power according to the inverter information, the first power being the total active power generated by the photovoltaic power station at the current moment; Obtaining a calculation deviation according to the first instruction value and the first power; Performing a first comparison between the absolute value of the calculated deviation and the deviation dead zone limit to obtain a first comparison result; When the first comparison result is that the absolute value of the calculated deviation is greater than the deviation dead zone limit, obtaining a current deviation according to the calculated deviation; Performing a second comparison between the absolute value of the current deviation and the switching boundary value to obtain a second comparison result; When the second comparison result is that the absolute value of the current deviation is greater than the switching limit value, a second instruction value is calculated by pure proportional control, and the second instruction value is an active power setting value of the photovoltaic power station calculated by the controller based on the deviation; When the second comparison result is that the absolute value of the current deviation is not greater than the switching limit value, proportional integral control is used to calculate the second instruction value; The scheduling instruction is allocated according to the second instruction value and the inverter information.

2. The photovoltaic power station active power integrated closed-loop control method according to claim 1, characterized in that: The step of obtaining the first instruction value according to the scheduling instruction is: Obtaining a third instruction value and an instruction setting dead zone value; the third instruction value is an active setting value input by the controller at the last moment; Obtaining an instruction difference according to the scheduling instruction and the third instruction value; Performing a third comparison between the absolute value of the instruction difference and the instruction setting dead zone value to obtain a third comparison result; When the third comparison result is that the absolute value of the instruction difference is not less than the instruction setting dead zone value, obtaining a first instruction value according to the scheduling instruction; When the third comparison result is that the absolute value of the instruction difference is smaller than the instruction setting dead zone value, the scheduling instruction is not executed.

3. The photovoltaic power station active power integrated closed-loop control method according to claim 2, characterized in that: When the third comparison result is that the absolute value of the instruction difference is smaller than the instruction setting dead zone value, the first instruction value is the third instruction value.

4. The photovoltaic power station active power integrated closed-loop control method according to claim 1, characterized in that: Performing a fourth comparison between the absolute value of the current deviation and the deviation dead zone limit to obtain a fourth comparison result; When the fourth comparison result is that the absolute value of the current deviation is not greater than the deviation dead zone limit, the dispatching instruction is not allocated according to the second instruction value and the inverter information; Otherwise, the scheduling instruction is allocated according to the second instruction value and the inverter information.

5. The photovoltaic power station active power integrated closed-loop control method according to claim 4, characterized in that: Not executing the allocation of the scheduling instruction according to the second instruction value and the inverter information includes: The second instruction value is the fourth instruction value; the fourth instruction value is the active instruction return value executed at the last moment.

6. The photovoltaic power station active power integrated closed-loop control method according to claim 1, characterized in that: The second instruction value is obtained according to Formula 1, which is: PV cmd_out =Kp*err+Ki*not(k)+PV act (k); Where, PV cmd_out is the active power setting value of the photovoltaic power station calculated by the controller based on the deviation, Kp is the proportional coefficient, err is the current deviation, Ki is the integral coefficient, inte(k) is the accumulated amount of deviation integral at the current moment, PV act (k) is the total active power generated by the photovoltaic power station at the current moment.

7. The photovoltaic power station active power integrated closed-loop control method according to claim 6, characterized in that: When the first comparison result is that the absolute value of the calculated deviation is not greater than the deviation dead zone limit, the current deviation and the first integral accumulation amount are reset to zero, where the first integral accumulation amount is the deviation integral accumulation amount at the current moment.

8. The photovoltaic power station active power integrated closed-loop control method according to claim 6, characterized in that: When the second comparison result is that the absolute value of the current deviation is greater than the switching boundary value, the current deviation and the first integral accumulation amount are reset to zero, where the first integral accumulation amount is the deviation integral accumulation amount at the current moment; When the second comparison result is that the absolute value of the current deviation is not greater than the switching boundary value, the integral coefficient is the current integral coefficient, the first integral accumulation amount is the sum of the second integral accumulation amount and the current deviation, and the second integral accumulation amount is the deviation integral accumulation amount at the previous moment.

9. The photovoltaic power station active power integrated closed-loop control method according to any one of claims 1 to 8, characterized in that: The step of allocating the scheduling instruction according to the second instruction value and the inverter information is: Obtaining a first quantity, a second quantity, a second power and an installed capacity according to the inverter information; the first quantity is the number of stopped or faulty inverters, the second quantity is the number of normally operating inverters, and the second power is the actual active power generated by a single stopped or faulty inverter; The installed capacity refers to the installed capacity of a single inverter in normal operation; Obtain a third power according to the first quantity and the second power, where the third power is the total active power generated by all stopped or faulty inverters; Obtaining a total installed capacity according to the second number and the installed capacity, where the total installed capacity is the sum of installed capacities of inverters operating normally; Obtaining a fifth command value according to the difference between the second command value and the third power, wherein the fifth command value is a total active power command value of the inverter that can be allocated; The command value allocated to a single normally operating inverter is obtained according to the fifth command value, the installed capacity and the total installed capacity.

10. An electronic device, used to implement the photovoltaic power station active power integrated closed-loop control method according to any one of claims 1 to 9, characterized in that: It includes a data input module, a data processing module, a comparison and decision module, a controller and an execution module; The data input module: Used to obtain dispatch instructions, deviation dead zone limit, switching boundary value and inverter information; The data processing module: Used to obtain the first instruction value according to the scheduling instruction; Used to calculate the first power according to the inverter information; for obtaining a calculation deviation according to the first instruction value and the first power; for obtaining a current deviation according to the calculated deviation based on the first decision; The comparison decision module: Used to perform a first comparison between the absolute value of the calculated deviation and the deviation dead zone limit to obtain a first comparison result; for sending a first decision to the data processing module when the first comparison result is that the absolute value of the calculated deviation is greater than the deviation dead zone limit; For performing a second comparison between the absolute value of the current deviation and the switching boundary value to obtain a second comparison result; for sending a second decision to the controller when the second comparison result is that the absolute value of the current deviation is greater than the switching limit value; for sending a third decision to the controller when the second comparison result is that the absolute value of the current deviation is not greater than the switching limit value; The controller: for calculating a second command value by adopting pure proportional control based on the second decision; for calculating the second instruction value by using proportional-integral control based on the third decision; Used to send the second instruction value to the execution module; The execution module: Used to allocate the scheduling instruction according to the second instruction value and the inverter information.

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